Without getting too technical, the positive affirmations contained within the music are first recorded normally (spoken into a microphone), and then modulated (changed to be) above the threshold of human hearing. This means that when you listen the messaging will bypass your normal conscious hearing and penetrate the subconscious mind instead.
The human hearing threshold is around 20 khz. However, as we get older our hearing declines, so some people will struggle to hear above 18 khz. This means that those listening to the silent version of the recording – provided with each of the products in our subliminal range – who have very good hearing, may hear the occasional slightly high-pitched sound, similar to the sound of a Cricket.
If you hear this high-pitched sound, it means your ears are picking up on the high-end frequencies of the affirmation. However, the messaging will still bypass your conscious perception and penetrate the subconscious mind. Those with very good hearing may also hear the occasional high-pitched frequency on the versions containing a music overlay.
In addition, some headphones exaggerate high-end frequencies. So, depending on the headphones or speakers you are listening on, you may hear the occasional high-pitched frequency sound.